RB usage will remain a mystery for Eagles

Both Philadelphia Eagles running backs have been seen on the field at the same time during scrimmage sessions at training camp. And the mismatch possibilities are almost limitless.

But how they will employ them when the games start counting for real will not be known until then.

"You've seen it a lot. I don't know how much more you'll see it," intentionally vague offensive coordinator Pat Shurmur said before Tuesday's practice.

Sproles, who caught 232 passes over the last three seasons with the New Orleans Saints, was the Eagles' prized free agent addition of the offseason. McCoy led the NFL in rushing last season with 1,607 yards.

"I don't know what [those formations are] going to do, but it's going to be tough [for opponents]," McCoy said. "Because you don't know who has the ball, there's so many different options. And once we get Maclin out there stretching the field a little bit, you know, myself and Sproles, so many different motions ... and the hard part about it is not just having me and Sproles in the game at the same time, we're going at such a fast pace.

"It's really hard to just, OK, we've seen this formation from scouting and watching film, let's just line up into the defense we have for it. But we're going so fast, it's hard to really do that. So I think us working together, man, from passing the ball and running the ball, we're going to do a lot of damage."

LB Mychal Kendricks. Getting more comfortable on the inside every day, after playing all over his first year, then adjusting to new scheme last year. Will be a star for this defense.

Stock falling

K Carey Spear. Missed three of four FG attempts in first special-teams session. Hasn't done nearly enough to pose a serious threat to incumbent Alex Henery.

In the spotlight

Wide receiver depth. Having a bunch of established receivers out with various injuries, none of which is considered serious, could actually be beneficial for the coaching staff in terms of final evaluations.

Of Momah, an intriguing prospect who is 6-7, offensive coordinator Pat Shurmur said Tuesday: "He's made some plays out there in practice and he's made a huge amount of improvement from a year ago. It's night and day in terms of how much better a football player he is. So we just hope he can continue on that trend, I guess."

Merrill Reese says …

"It wouldn't be surprising for Jeremy Maclin to catch 80 passes this year."